HIF-1α regulates EMT via the Snail and β-catenin pathways in paraquat poisoning-induced early pulmonary fibrosis

Journal of Cellular and Molecular Medicine
Yong ZhuRui-lan Wang

Abstract

Paraquat (PQ) poisoning-induced pulmonary fibrosis is one of the primary causes of death in patients with PQ poisoning. Hypoxia-inducible factor-1α (HIF-1α) and epithelial-mesenchymal transition (EMT) are involved in the progression of pulmonary fibrosis. Snail and β-catenin are two other factors involved in promoting EMT. However, the relationship among HIF-1α, Snail and β-catenin in PQ poisoning-induced pulmonary fibrosis is not clear. Our research aimed to determine whether the regulation of HIF-1α in EMT occurs via the Snail and β-catenin pathways in PQ poisoning-induced pulmonary fibrosis. Sixty-six Sprague-Dawley rats were randomly and evenly divided into a control group and a PQ group. The PQ group was treated with an intragastric infusion of a 20% PQ solution (50 mg/kg) for 2, 6, 12, 24, 48 and 72 hrs. A549 and RLE-6TN cell lines were transfected with HIF-1α siRNA for 48 hrs before being exposed to PQ. Western blotting, real-time quantitative PCR, immunofluorescence, immunohistochemistry and other assays were used in our research. In vivo, the protein levels of HIF-1α and α-SMA were increased at 2 hrs and the level of ZO-1 (Zonula Occluden-1) was reduced at 12 hrs. In vitro, the transient transfection of HIF-1α siRNA re...Continue Reading

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Citations

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Methods Mentioned

BETA
Immunoprecipitation Assay
PCR
protein assay
transfection

Software Mentioned

SPSS

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